Common Name: Desert Tortoise Scientific Name: Gopherus agassizii Photographer: Calvin J. Hamilton Copyright: © 2004 Calvin J. Hamilton Date: 2004/04/20 Location: Red Rock Canyon, Nevada

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Turtles survived the mass extinction of dinosaurs and have thrived in their present form for approximately 150 million years. The Desert Tortoise is one of four species that have remained virtually unchanged since the Oligocene Epoch (27-37 million years ago).